PQW PIW不经过过程映像区，当程序扫描到这里是即输入或输出，与S7-200的立即读写相同，SFC34查询OB20的（时间中断）的状态，SFC33终止OB20的调用。

Output Parameter STATUS

Bit Value Meaning
0 0 Time-delay interrupt is enabled by the operating system.
1 0 New time-delay interrupts are not rejected.
2 0 Time-delay interrupt is not activated or has elapsed.
3 - -
4 0 Time-delay interrupt-OB is not loaded.
5 0 The execution of the time-delay interrupt OB is not disabled by an active test function.
M5.2为状态字MW4的低字节。